---
id: CVE-2025-66548
title: >-
  Nextcloud Deck is a kanban style organization tool aimed at personal planning
  and project organization for teams integrated with Nextcloud
summary: >-
  Nextcloud Deck is a kanban style organization tool aimed at personal planning
  and project organization for teams integrated with Nextcloud. Prior to 1.12.7,
  1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters,
  tric…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-116
vendor: nextcloud
product: deck
affected:
  - deck < 1.12.7
  - 'deck >= 1.14.0, < 1.14.4'
  - 'deck >= 1.15.0, < 1.15.1'
patched:
  - deck 1.15.1
published: '2025-12-05'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:10:00.327'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66548'
references:
  - url: >-
      https://github.com/nextcloud/deck/commit/afa95d3c507465b9d31af7c88c69b76711ef185a
    label: security-advisories@github.com
  - url: 'https://github.com/nextcloud/deck/pull/6671'
    label: security-advisories@github.com
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xjvq-xvr7-xpg6
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/2326618'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00154
epssPercentile: 0.04467
ingestedAt: '2026-10-27T18:12:09.279Z'
---

## Overview

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.12.7, 1.14.4, and 1.15.1, file extension can be spoofed by using RTLO characters, tricking users into download files with a different extension than what is displayed. This vulnerability is fixed in 1.12.7, 1.14.4, and 1.15.1.

## Affected

- `deck < 1.12.7`
- `deck >= 1.14.0, < 1.14.4`
- `deck >= 1.15.0, < 1.15.1`

## Remediation

Upgrade past the affected range:

- `deck 1.15.1`